Stair-builder&#39;s pitch-board.



I No. 684,490. Patented 001'. l5, |90l.

W. T. WIBLE. STIR BUILDERS FITCH BOARD.

. (Application sled Feb. 4, 1901.) l"(No Model.)

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NITE@ AES lVILLIAM T. VIBLE, OF DERBY STATION, PENNSYLVANIA.

STAIR-BULDERS PITCH-BOARD.

SPECIFICATION forming part of Letters Patent No. 684,490, dated October15, 1901.

Application led February 4, 1901. Serial No. 45,919. (No model.)

T0 cir/ZZ whom t may concern:

Be it known that l, WILLIAM T. WIBLE, a citizen of the United States ofAmerica, residing at Derry Station, in the county of Westmoreland andState of Pennsylvania, have invented certain new and useful Improvementsin Stair-Builders Pitch-Boards, of which the following is aspecification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements insquares, and has for its object to construct a square particularlyadapted for use in laying out steps and stairs, the device being of theform of tool frequently termed in the trade a stair-builders pitchboard.

The object of my invention is to construct a tool of this characterwhich may be employed as an ordinary try-square and which is readilytransferable into a stair-builders pitch-board, having provision whenused as a tool of this nature for providing for the tightening-wedgealways employed in connection with stairs or steps for tightening thesame.

Briey described, my invention comprises two arms or blade members ofunequal length and which are scaled on both sides to thirtyseconds alongthe outer edge, which edge is straight,the blades bein g widest attheirouter ends, the difference in width being such that a straight linedrawn from their narrowest point parallel With the straight outer edgewould form a wedge shape representing the Wedge employed for tighteningsteps and stairs.

In describing the invention in detail reference will be had to theaccompanying drawings, forming a part of this specication, and whereinlike numerals of reference will be employed for designating like partsthroughout the several views of the drawings, in which- Figure 1 is adetail plan view of my improved pitch-board. Fig. 2 is an edge viewthereof. Fig. 3 is an edge view of the detachable gage removed from thesquare. Fig. 4t is a plan view of a part of one of the reverse sides ofthe blade to that shown in Fig. l. Fig. 5 is a detail perspective Viewof the detachable nosing-piece removed from the square.

In the drawings, l represents the long arm or blade of the square, and 2the short arm 0r blade thereof. In practice I have found a convenientlength for these arms to be ten inches for the shorter arm and fourteenfor the longer arm, though of course I do not wish to limit to theselengths, merely specifying to showthe practicalproportionatelength. Eacharm is provided with a straight outer edgethat is, the ou ter edge ofthe one arm lies at a direct right angle to the outer edge of the otherarm-and the arms are scaled along both faces at the straight edges, thescale being preferably made thirty-seconds, in order to employ theinstrument for tine work. These blades may be constructed of steel orlike material, as in an ordinary try-square, being integral with eachother, and the inner edge of these arms is at an angle to the outer edgethroughout the length of both arms. This gives the arms a somewhat wedgeshape, as a line drawn parallel with the outer edge from a point Wherethe inner edges meet to the ou ter ends of the arms would give a wedgeshape part of the square, which would be the exact shape and size of theWedge employed for wed ging up stairs or steps. 'Where a nosing is to beprovided for in the steps or stairs, I have made provision therefor inthe laying out of the steps by having a detachable nosing-piece 3,adapted to be secured to the square by means of a screw 4, as shown, andhaving a shoulder 5 to abut against the straight edge of the square inorder that the same may be held stationary when in position. The gage 6for determining the pitch consists of a bar provided with two oblongslots '7, adapted one to receive the longer arm and the other theshorter arm, the blades or arms being spanned by the gage. This gage isvpreferably provided with a number of threaded openings 8, so that theset-screws 9, which secure the gage to the arms, may be adj usted fromone position to another, as may be required by the position of the gageupon the square.

l0 is an aperture formed in the nosingpiece .3, in which is inserted asharp tool, such as an awl or the like for marking out the lines.

In the drawings I have shown dotted lines on both of the arms of thesquare drawn from IOO the point where the inneredges meet the length ofthe arms parallel with the outer edges. The space between these dottedlines and the inner edges of the arms represents the tightening-wedge.This Wedge on both riser and step is calculated to be one-halt` inchthick at the large end, terminating in a point. When the nosing is inposition, as shown in Fig. l, it Will be observed that by marking aroundthe square and nosingthe neat dimensions of the step, including itsynosing, will be obtained Without other measurey ments 0r patterns, andthe same may be done with the riser, as byimarking around the square theshape of both riser and step to be housed out will be obtained. In theoase of laying out open stair strings or 'horses the nosing mayberemoved, the gage set to the desired places, the square reversed on theface side of the board, and the strings or horses marked out, as will bereadily apparent, since the square end of gage can be reversed to bothsides of the strings, thus dispensing with any other tools.

Having fully described my invention, what I claim as new, an d desire tosecure by Letters Patent, is-

In a device of the character described, two` integral arms of unequallength, extending at right angles to each other, said arms havingstraight outer edges at right angles to each other and their inner edgesat an incline to said outer edges, scales arranged on both straightedges of said arms, in combination with a gage slotted to receive bothof the said arms, said gage having formed therein a series of threadedperforations transverse to the said slots, a thumb-screw operating insaid perforations and engaging the said arms to hold the gage in alocked position, and a perforated nosepiece having a cut-away portionforming a shoulder removably connected to said arms, substantially asdescribed.

In testimony whereof I affix my signature in the presence of twowitnesses.

WILLIAM T. VIBLE.

I Witnesses:

JOHN NOLAND, E. E. POTTER.

